RS125 Gearbox Assembly

In this video I am demonstrating how to assemble the Aprilia RS125 Rotax 122 engine's gearbox

[@gazmtg]

There is a flat on shift drum between gears. There's also a raised notch on the rear of the shift drum that pushes the neutral light switch.

[@Th3StrangeQuark]

@AntelopeSam you can use either! Use 10w - 40 engine oil, or 75w - 90 gearbox oil! :)

[@setrasdimesjon]

Thanks! That helped alot man! Btw could you make a video or a guide how to get the final parts after that in? you know how to get the gear pin that stick out of the left side on the enginge.. would been great

[@Maniekmatrix]

Thanks mate! Helped a lot! :)

[@gazmtg]

I use Castrol VMX 80 gear oil. Works well.

[@mioszgolonka5817]

Good job :)

[@AdRy16Gu]

thank you very much!

[@deparpejpetodile6566]

👍

[@agnosticfrontliner]

what type of gearbox oil do you use ? cause my manual (of a '07 rs125) says to use SAE 75 W 90 , but my former mechanic (from who I bought it) claimed it needed 10W40 engine oil I've had my bike for about a year now and I've had lots of trouble with it, my gearbox already needed two complete rebuilds and the engine needed 3/4 rebuilds got it back for about a week (still riding it in) and my second gear makes way more nose then the others... so my guess is that it's got the wrong gearbox oil?

[@srsport]

Great video. I found it through your post about the complete engine rebuild, nice. Did you use an aftermarket crankshaft for the rebuild or a rebuilt crankshaft?

[@l3g10n-i1u]

is that NIN in the background?, Great vid, im trying to repair my gearbox and this is quite enlightning

[@jonp8153]

Hey bud just found your clip . How much does this cost to have done installing new. Thanks.

[@gazmtg]

@setrasdimesjon I can't do that. The engine was assembled a month ago and is in my bike.

[@andywilliams67]

Hi mate I've got an aprillia rs 125 2005 model and it won't go into 1st or 2nd gear but goes into 3rd what could it be thanks

[@Gixermarino]

i can get the gears in but the selector dont line up whats going on ?

[@16vastraturbo]

16vastraturbo its for the rotax 122 engine.....

[@octymocty132]

hi can you help i used you vid an a rotax build book to rebuild a april rs 125 ( 122 lump ) after full assemble i now am having shift issues can't go down with out a fight would you have any clue to what could cause this issue ?

[@gazmtg]

Duncan Harris can you explain in more detail how it feels?

[@gazmtg]

@Josh13992 Rotax 122

[@michaelpetty1639]

How much did the gearing cost all together

[@TheTerrydactor96]

Would that be the same on a rotax go kart??

[@AntelopeSam]

engine oil... or gearbox oil?

[@16vastraturbo]

does anybody have any gears for the output shaft for sale??? am after the last one on the end...GEAR Z=30 its called, message me if you have... regards

[@Skittledikk]

You forgot the reverse gear ;)

[@garyhope6577]

A late reply. This is my personal account. Reverse gear ? We don't need a reverse gear on no stinking 2 stroke. If you can turn the engine quickly enough to start it, it'll run backwards or forwards.